None of the ones that you listed are idiot-proof. Limes and avocados will have to be grown in large containers, and brought indoors in the winter.

Peaches and plums will need multiple sprays a year to get any fruit, so you will have to invest in a sprayer and some chemicals.

If you want foolproof, try figs, mulberries, blueberries, pears, pomegranates, and persimmons.

As far as citrus, try the hardy citrus such as citrumelos, citrangequats, etc..